ASTM A193

• Standard Specification for Alloy Steel and Stainless Steel for High Temperature or High Pressure Service and Other Special Applications.

• Common ASTM A193 Grades Supplied by BSMI.

  B7	Allow Steel, AISI 4140/4142 Quenched and Tempered
  B8	Class 1 Stainless Steel, AISI 304, Carbide Solution Treated
  B8M	Class 1 Stainless Steel, AISI 316, Carbide Solution Treated

• A193 Mechanical Properties

  Grade	Size	Tensile Ksi, Min	Yield Ksi, Min	Elongation %, Min	RofA %, Min
  B7	Up to 2-1/2	125	105	16	50
  	2-5/8 to 4	115	95	16	50
  	4-1/8 to 7	100	75	18	50
  B8 CL 1	ALL	75	30	30	50
  B8M CL 1	ALL	75	30	30	50

• A193 Chemical Properties

  Element	B7(4140) %	B8(304) %	B8M(316) %
  Carbon	0.37 - 0.49	0.08 Max	0.08 Max
  Manganese	0.65 - 1.10	2.00 Max	2.00 Max
  Phosphorus, Max	0.035	0.045	0.045
  Sulfur, Max	0.04	0.03	0.03
  Silicon	0.15 - 0.35	1.00 Max	1.00 Max
  Chronium	0.75 - 1.20	18.0 - 20.0	16.0 - 18.0
  Nickel	N/A	8.0 - 11.0	10.0 - 14.0
  Molybdenum	0.15 - 0.25	N/A	2.00 - 3.00

• A193 Recommended Hardware.

  Grade	Nuts	Washers
  B7	A194 Grade 2H	F436
  B8 Class 1	A194 Grade 8	304ss
  B8M Class 1	A194 Grade 8M	316ss

• The provided information was taken directly form the listed ASTM Standard, Additional information can be found in ASTM A193-12b.

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